A006388 Number of sensed planar maps with n edges and without faces of degree 1. (Formerly M1633)

1, 1, 2, 6, 18, 74, 393, 2282, 14700, 99614, 703519, 5123598, 38279496

Offset

0,3

References

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

Links

Table of n, a(n) for n=0..12.

Timothy R. Walsh, Generating nonisomorphic maps without storing them, SIAM J. Algebraic Discrete Methods 4 (1983), no. 2, 161-178.

Crossrefs

Cf. A006384, A006389 (unsensed), A379433 (rooted).

Sequence in context: A004395 A277862 A213427 * A007116 A280763 A079391

Adjacent sequences: A006385 A006386 A006387 * A006389 A006390 A006391

Keyword

nonn,more

Author

N. J. A. Sloane

Extensions

a(8)-a(12) from Sean A. Irvine, Mar 28 2017

a(0)=1 prepended by Andrew Howroyd, Jan 16 2025

Status

approved